unbridled expression of disgust, usually transmitted through uncontrollable contraction of uppertorso, facial muscles, and full on squintage, as if staring dead-on into high-beams. Typically done while sitting, but may also involve lower extremities while standing

synonyms: "sir grumpalot's favorite expression". "the grumpster"

"Upon discovery of incomplete work, the consultant went into full body recoil, or FBR for short"